package com.ruoyi.gateway.config;

import lombok.AllArgsConstructor;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

import java.util.ArrayList;
import java.util.List;

/**
 * @ClassName SwaggerProvider
 * @PackageName com.ruoyi.gateway.config
 * @Description
 * @Author daiz
 * @Date 2019/8/16 10:04
 * @Version 1.0
 */
@Component
@Primary
@AllArgsConstructor
public class SwaggerProvider implements SwaggerResourcesProvider
{
	public static final String      API_URI = "/v2/api-docs";

	private final RouteLocator      routeLocator;

	private final GatewayProperties gatewayProperties;

	@Override
	public List<SwaggerResource> get()
	{
		List<SwaggerResource> resources = new ArrayList<>();
		List<String> routes = new ArrayList<>();
		// 取出gateway的route
		routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
		// 结合配置的route-路径(Path)，和route过滤，只获取有效的route节点
		// 打开下面注释可以自动扫描接入gateway的服务，为了演示，只扫描system
		 gatewayProperties.getRoutes().stream().filter(routeDefinition ->
		 routes.contains(routeDefinition.getId()))
//		gatewayProperties.getRoutes().stream().filter(routeDefinition -> routeDefinition.getId().equals("ruoyi-system"))
				.forEach(routeDefinition -> routeDefinition.getPredicates().stream()
						.filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
						.forEach(predicateDefinition -> resources
								.add(swaggerResource(routeDefinition.getId(), predicateDefinition.getArgs()
										.get(NameUtils.GENERATED_NAME_PREFIX + "0").replace("/**", API_URI)))));
		return resources;
	}

	private SwaggerResource swaggerResource(String name, String location)
	{
		SwaggerResource swaggerResource = new SwaggerResource();
		swaggerResource.setName(name);
		swaggerResource.setLocation(location);
		swaggerResource.setSwaggerVersion("2.0");
		return swaggerResource;
	}
}